Nature s Way Premium Extract Olive Leaf Standardized to 12% Oleuropein 250 mg per serving. Olive Leaf is used to support heart health.* We source Nature?s Way Olive Leaf Extract from the Mediterranean where olives are an important part of the daily diet. The leaves are collected from the trees after the olive fruit harvest. You?re likely familiar with the benefits of a Mediterranean diet and probably have a bottle of olive oil in your pantry right now. Add Olive Leaf to your routine for heart health support.*